Writing instrument



FIG. 1 is a left side perspective view of a writing instrument showing my new design;

FIG. 2 is a front devotional view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevations view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a top view thereof. 

CLAIM The ornamental design for a writing instrument, as shown and described. 